Operative Dentistry I: Amalgam Restoration II
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Questions and Answers

What is the recommended minimum thickness for an amalgam restoration cavity preparation?

  • 2 mm
  • 1.5 to 2 mm (correct)
  • 3 mm
  • 1 mm

    • Which form is designed to prevent dislodgment of the restoration during insertion?

  • Retention form (correct)
  • Resistance form
  • Convenience form
  • Outline form

    • What is one of the principles of resistance form in cavity preparation?

  • Complete removal of dentin
  • Narrow proximal margins
  • Flat occlusal surfaces
  • Rounded internal angles (correct)

    • Which feature is not involved in the convenience form of cavity preparation?

    <p>Minimum thickness requirement (C)</p> Signup and view all the answers

    What is a common auxiliary means used to enhance retention in cavity preparations?

    <p>Coves (A)</p> Signup and view all the answers

    In amalgam cavity preparation, what should be established at the cavosurface margin?

    <p>90º angle (D)</p> Signup and view all the answers

    Which of the following is NOT part of the initial tooth preparation depth?

    <p>Gingival wall height (C)</p> Signup and view all the answers

    What step is essential before proceeding with cavity preparation?

    <p>Take radiographs (A)</p> Signup and view all the answers

    What determines the selection of alloy in dental amalgam?

    <p>The shape of particles (C)</p> Signup and view all the answers

    What is the ideal ratio of alloy to mercury in dental amalgam manipulation?

    <p>1:1 (D)</p> Signup and view all the answers

    What can result from under-trituration of amalgam?

    <p>A dull, friable mix (D)</p> Signup and view all the answers

    Which of the following is NOT a reason for condensing amalgam mix?

    <p>To reduce plaque retention (B)</p> Signup and view all the answers

    Why is it necessary to overfill the cavity by 1 mm during amalgam placement?

    <p>To account for shrinkage during hardening (A)</p> Signup and view all the answers

    What is the purpose of burnishing an amalgam restoration?

    <p>To remove excess mercury (A)</p> Signup and view all the answers

    What is the primary goal of carving the amalgam restoration?

    <p>To restore normal anatomy and contour (B)</p> Signup and view all the answers

    Which type of margin is identified when the explorer tip catches from amalgam to tooth?

    <p>Submargin/Ditch (C)</p> Signup and view all the answers

    Flashcards

    Amalgam Cavity Preparation

    The process of shaping a tooth cavity to hold a dental amalgam filling.

    Cavity Principles

    Rules for shaping a cavity to ensure strength, retention, and ease of filling.

    Initial Tooth Preparation Depth

    The depth of the cavity in relation to the pulp.

    Outline Form Margin

    The outer edges of the prepared cavity.

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    Retention Form

    Features in the cavity that keep the filling from coming out.

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    Resistance Form

    Features that prevent the filling from shifting when force is applied.

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    Convenience Form

    Features that make placing and working with the filling easier.

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    Amalgam Manipulation

    The technique of mixing and placing amalgam.

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    Amalgam Alloy Selection

    Choosing the right amalgam alloy depends on factors like particle shape, copper content, and zinc content for specific cases.

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    Amalgam Trituration

    Mixing mercury and alloy particles to create a smooth, workable amalgam.

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    Amalgam Condensation

    Compacting the amalgam mixture into the cavity, increasing its density and adapting it to the margins.

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    Burnishing Amalgam

    Smoothing the amalgam surface, removing excess mercury, and helping adaptation to the tooth margin.

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    Amalgam Carving

    Sculpting the amalgam to match the tooth's anatomy, improving aesthetics and fit.

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    Amalgam Finishing/Polishing

    Removing rough surfaces, reducing plaque retention, and preventing corrosion for better oral hygiene.

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    Margin Types (Dental)

    Different types of margins categorized as 'flash,' 'sub-margin/ditch,' or 'open margin', indicating how amalgam fits the teeth.

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    Amalgam Overfilling

    Slightly overfilling the cavity with amalgam to allow for shrinkage during setting.

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    Study Notes

    Operative Dentistry I: Amalgam Restoration and Manipulation II

    • Course offered by Dr. Luluah K. Alhagas, Assistant Professor in Operative Dentistry, Batterjee Medical College, 2024.

    Lecture Objectives

    • Identify amalgam cavity preparations.
    • Identify amalgam manipulations.
    • Recognize amalgam safety precautions.

    Dental Amalgam Cavity Preparation

    • A pre-operative assessment of the case is necessary, including medical/dental history, radiographs (OPG, BW), chief complaint, and dental screening.

    Local Anesthesia

    • Local anesthesia procedures are a part of the preparation process

    Isolation

    • Isolation techniques are crucial for the procedure.

    Cavity Preparation: General Requirements

    • Remove defects like caries and faulty restorations.
    • Extend the preparation onto sound enamel.
    • Establish a 90-degree cavosurface margin.
    • Maintain a minimum thickness of 1.5-2 mm.
    • Prepare undercuts appropriately.
    • Add supplemental features like grooves, slots, pins, and/or cove as needed.

    Cavity Preparation: Cavity Principles

    • Establish initial tooth preparation depth.
    • Outline form.
    • Cavosurface margin.
    • Primary retention form.
    • Primary resistance form.
    • Convenience form.

    Initial Tooth Preparation Depth

    • Pulpal floor depth: 1.5 mm from central groove.
    • DEJ depth: 3 mm from central groove.
    • Axial wall depth: measures from DEJ to axial wall.

    Outline Form/Cavosurface Margin

    • The cavosurface margin should be at a 90-degree angle.

    Retention Form

    • Primary retention prevents dislodgement during insertion.
    • Secondary retention adds support with locks, coves, pins, and slots

    Resistance Form

    • Primary resistance prevents dislodgement from apical or oblique forces.
    • Cusp and marginal ridges are preserved.
    • Walls are prepared perpendicular to occlusal forces.
    • Rounded internal preparation angles are maintained.
    • Unsupported or weakened tooth structures are removed.

    Convenience Form

    • Features that improve accessibility for caries removal, matrix placement, and amalgam insertion.
    • Proximal margins are extended to create space from adjacent teeth.

    Dental Amalgam Manipulation

    • Alloy selection, Proportion of alloy, Trituration of alloy, Condensation of amalgam mix, Finishing/polishing of the Restoration, Carving of the Restoration, Burnishing of the Restoration, Checking occlusion, Checking margin, and Amalgam Carrier, Amalgam Safety Precautions are all part of the manipulation process.

    Alloy Selection

    • Alloy choice depends on the specific case, considering particle shape, copper content, and zinc content.

    Alloy Proportion

    • The ratio of alloy to mercury is typically 1:1.
    • An adequate amount of mercury coats alloy particles to create a homogeneous amalgam mix.
    • Insufficient mercury causes uncoated particles, resulting in a dry/friable amalgam mix.
    • Excessive mercury results in a weak amalgam and excess creep/flow.

    Trituration Proportion

    • Trituration involves mixing mercury and alloy particles until a homogeneous, plastic mass of condensable amalgam is formed.

    Under-Trituration & Over-Trituration

    • Insufficient mixing of mercury and alloy results in under-trituration, presenting a dull and fragile mixture.
    • Excessive mixing results in over-trituration, leading to a shiny and hard mixture.

    Amalgam Carrier

    • Amalgam carriers are specialized tools for handling and placing amalgam.

    Condensation of Amalgam Mix

    • Increase adaptation by incorporating excess mercury to the surface.
    • Increase amalgam density.
    • Increase final strength by overfilling cavity by 1mm

    Burnishing of Amalgam Restoration

    • To remove excess mercury from the surface.
    • to provide guidelines for amalgam carving.
    • to increase adaptation at the restoration margin

    Carving of Amalgam Restoration

    • Restore normal tooth anatomy and contour.
    • Improve adaptation at the restoration margin.

    Checking Occlusion

    • Occlusion is checked to ensure proper contact and function.

    Checking Margin

    • Methods for evaluating the integrity of the amalgam's margin.
    • Flash margin: Explorer tip catches the tooth to amalgam.
    • Submargin/ditch: Explorer tip catches the amalgam to tooth.
    • Open margin: Explorer tip catches in both directions.

    Finishing/Polishing of Amalgam Restoration

    • Reduce plaque retention.
    • Reduce tarnish and corrosion.

    Dental Amalgam Safety Precautions

    • Proper disposal of amalgam debris (scrap on bracket table, amalgamator aerosol, amalgam scrap container, amalgam waste , mercury in plumbing traps).

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    Related Documents

    Operative Dentistry I - Amalgam Restoration and Manipulation II (2024) PDF

    Description

    Test your knowledge on amalgam cavity preparations and manipulations in Operative Dentistry I. This quiz covers essential techniques, safety precautions, and the requirements for effective cavity preparation. Perfect for students of Batterjee Medical College.

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